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Episode 73: Quantum Money with Jiahui Liu

Physics Frontiers

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The Problem With Quantum Money

Quantum money was first put forward in the 1960s by Hans Wiesner. The idea is that a bank and a user each prepare a quantum state with a serial number, which specifies uniqueness. But if you don't know which basis for each qubit is chosen to encode the bits, you won't be able to measure the state correctly. If I publish this information of the basis, clearly it's not secure because if the adversary knows the basis information,. It can measure each qubit in the graph basis and it recovers the other line secret.

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